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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 20 |
| 2 | 5832 |
| 3 | 1866940 |
| 4 | 600952464 |
| 5 | 193501302500 |
| 6 | 62306755217496 |
| 7 | 20062580544024460 |
| 8 | 6460088608059172128 |
| 9 | 2080128468849137350580 |
| 10 | 669794906874257832297960 |
| 11 | 215671879884924524197142620 |
[0,20,5832,1866940,600952464,193501302500, 62306755217496,20062580544024460, 6460088608059172128,2080128468849137350580, 669794906874257832297960, 215671879884924524197142620] |